package org.example.state;

import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.api.common.state.MapState;
import org.apache.flink.api.common.state.MapStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;
import org.example.data.WaterSensor;
import org.example.function.WaterSensorMapFunction;

import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

/**
 * 按传感器+水位值进行分组统计每一种水位出现的次数
 */
public class KeyMapStateDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        DataStreamSource<String> source = env.socketTextStream("localhost", 9999);
        SingleOutputStreamOperator<WaterSensor> sensorDS = source.map(new WaterSensorMapFunction());

        WatermarkStrategy<WaterSensor> waterSensorWatermarkStrategy = WatermarkStrategy
                //指定乱序的Watermark生成，延时。
                .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                .withTimestampAssigner((WaterSensor waterSensor, long l) -> {
                    //返回的时间戳 毫秒
                    return waterSensor.getTs() * 1000;
                });

        SingleOutputStreamOperator<String> process = sensorDS.keyBy(WaterSensor::getId).process(new KeyedProcessFunction<String, WaterSensor, String>() {
            //可以定义多个状态
            MapState<Integer, Integer> vcMapState;
            //ValueState<String> lastIdValue;

            @Override
            public void open(Configuration parameters) throws Exception {
                super.open(parameters);
                vcMapState = getRuntimeContext().getMapState(new MapStateDescriptor<Integer, Integer>("vcMapState", Types.INT, Types.INT));

            }

            @Override
            public void processElement(WaterSensor value, KeyedProcessFunction<String, WaterSensor, String>.Context ctx, Collector<String> out) throws Exception {
                Integer vc = Optional.ofNullable(vcMapState.get(value.getVc())).orElse(0);
                vcMapState.put(value.getVc(), vc + 1);

                StringBuilder sb = new StringBuilder("");
                sb.append("传感器：" + value.getId());

                vcMapState.iterator().forEachRemaining((pair) -> {
                    sb.append(" vc：" + pair.getKey() + " count：" + pair.getValue() + "\n");
                });
                out.collect(sb.toString());
            }
        });
        process.printToErr("");
        env.execute("KeyedStateDemo");
    }
}
